28oct12 Note that the commandline to complie torpot.c goes like this. $ make -f mac.mf torpot You can save a step by doing $ make -f torpot.mf And, if you are particularly lazy, just $ make will work. But only if the file called Makefile is in the same directory as the source file torpot.c Use the filemerge utility for macs to compare $ ./filemerge torpot.mf mac.mf If the mac executable called filemerge here works on your mac (you can never tell) you can put it into your ~/bin directory and put ~/bin on your shell path.